Combined Path Loss and Shadowing
Models for path loss and shadowing can be superimposed to capture power falloff versus distance along with the random attenuation about this path loss from shadowing.
Combined Path Loss:
- In this combined model, average dB path loss (μψ dB) is characterized by the path loss model and shadow fading, with a mean of 0 dB, creates variations about this path loss
- Specifically, this curve plots the combination of the simplified path loss model and the log-normal shadowing random process
- For this combined model the ratio of received to transmit power in dB is given by:
ψdB is a Gauss-distributed random variable with mean zero and variance σ2ψdB.
- The path loss decreases linearly relative to log10 d with a slope of 10γ dB/decade, where γ is the path loss exponent.
- The variations due to shadowing change more rapidly, on the order of the decorrelation distance Xc